Add reason for skipped codeop test

Lib/test/test_codeop.py

@@ -127,7 +127,7 @@ class CodeopTests(unittest.TestCase):
         av("def f():\n pass\n#foo\n")
         av("@a.b.c\ndef f():\n pass\n")
 
-    @unittest.skip("TODO: RUSTPYTHON")
+    @unittest.skip("TODO: RUSTPYTHON (SyntaxError: Got unexpected EOF at line 4 column 1)")
     def test_incomplete(self):
         ai = self.assertIncomplete